An appropriate balance between soil air and soil water must be maintained since soil air is displaced by soil water. Air can fill soil pores as water drains or is removed from a soil pore by evaporation or root absorption. The network of pores within the soil aerates, or ventilates, the soil. This aeration network becomes blocked when water enters soil pores.
Moissanite (/ËmÉÉªsÉnaÉªt/) is the name given to naturally occurring silicon carbide and to its various crystalline polymorphs. It has the chemical formula SiC and is a rare mineral, discovered by the French chemist Henri Moissan in 1893.
Re: Helenite..Don't Be Fooled! Helenite is glass in the same sense that natural obsidian is glass. Helenite is synthesized from ash from Mount Saint Helens. It is an absolutely beautiful material - especially the stones that are four carats or more. I own scores of different types of natural gems - including zultanite, color change garnet, apatite. I never - almost never - buy synthetic stones, but helenite is absolutely gorgeous. I have become a fan.